api.lisp contains all the plplot library / CFFI interface calls. Not every function in the plplot API is available, though all the ones that are associated with drawing/graphing should be. Others can of course be added as desired.

The file system-examples.lisp contains some examples of how you might directly use the functions in cl-plplot-system. Also, src/examples/ contains Lisp versions of all the standard PLplot examples. Other useful resources are the documentation that comes with plplot, the examples that come with plplot, the (admittedly somewhat sparse) comments in api.lisp & possibly plplot.h.

A callback has been added that should trap PLplot when it tries to call exit() and instead cause a Lisp side error to be thrown. If you find a PLplot error that is not trapped by this callback please let me know.